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Accounts Receivable, Net and Revenue Concentrations - Accounts Receivable (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Accounts Receivable, Net, Current [Abstract]        
Trade receivables, gross $ 131,229 $ 119,090    
Allowance for doubtful accounts (960) (822) $ (728) $ (616)
Allowance for sales returns (490) (507)    
Net trade receivables 129,779 117,761    
Other 4,659 4,040    
Accounts receivable, net $ 134,438 $ 121,801